Claude Opus 5.5 vs GLM 5.1
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
GLM 5.1
It used to be. Was SOTA in Reasoning.
| Category | Claude Opus 5.5 | GLM 5.1 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #46 · #46 in General LLM Margin 24.468085106382972 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #42 · #42 in Reasoning Margin 22.872340425531917 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #35 · #35 in Science Margin — Epoch AI benchmarking hub · Apr 7, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #50 · Was SOTA · Coding › Web dev Margin 39.2 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #42 · Was SOTA · Long context Margin 22.34042553191489 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Factuality Margin 26.162790697674424 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GLM 5.1: $1.4834999999999998 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GLM 5.1: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in General LLM at #2 against #46.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Reasoning at #1 against #42.
Science: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Science at #31 against #35.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Coding › Web dev at #1 against #50.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Long context at #1 against #42.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Factuality at #1 against #44.
Claude Opus 5.5 or GLM 5.1?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.
Claude Opus 5.5 or GLM 5.1 for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in General LLM at #2 against #46.
Claude Opus 5.5 or GLM 5.1 for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Reasoning at #1 against #42.
Claude Opus 5.5 or GLM 5.1 for Science?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.1 in Science at #31 against #35.